var MongoClient = require('mongodb').MongoClient
var url = "mongodb://localhost:27017/"

MongoClient.connect(url, {useNewUrlParser: true, useUnifiedTopology: true}, function(err, db) {
  if(err) throw err
  var dbo = db.db("laochen")
  dbo.collection("users").find({}).toArray(function(err, result) {
    // 返回集合中所有数据
    if(err) throw err
    console.log(result)
    db.close()
  })
})


